Each computer cost before finance charges could be simply calculated by simple interest rate. If we are not very sure how they want you to calculate the finance charges, but if it's just simple interest then the answer could be find out by:
Suppose, Let D = cost of desktop
Then L = cost of laptop = D + (whatever the cost of the laptop is)
Putting the values for the cost of desktop and laptop , the cost before finance charges is easy to obtain with the specific amount of interest rate(that should be given). If the cost of the laptop is low as compared to computer desktop, we would prefer laptop.
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